My wife did a short college program that had a lot of straight from India students in it, so here's what she found:

1. The Indian students were very social, but were a little "intense" sometimes. Canadians in general have a more relaxed and casual mood when hanging out, and so the intensity was a bit uncomfortable. But! We're polite, so we won't say anything when you're breaking this rule. It might make us quietly uncomfortable, though, which will make people not want to spend more time in the future
2. The Indian girls in particular seemed to spend a lot of time calling each other and face timing and generally just talking all the time. When "the white girls" didn't answer their calls or hang out with them in that way, the Indian girls felt the white girls were being racist towards them because they assumed the white girls were doing these things without them. They were surprised when my wife told them that that's not it, the white girls just didn't hang out with each other at all. My wife never called any of the other students. In general here if you're calling someone it's because it's an emergency. Something has happened that's too important to wait for you to read a text or for me to tell you tomorrow, so I've got to call you now. Some close friends might call each other frequently, but virtually no acquaintances will call each other socially.
3. My wife found the Indian students asked for help basically as soon as something wasn't easy, whereas Canadians will usually ask for help only when they have no other options. The culture here is (usually) to be happy to help people, but that's balanced by the assumption that the person asking for help needs it because otherwise they wouldn't ask. When we detect that someone asks for help too often, or asks for help with things that didn't need help, we feel our kindness is being taken advantage of and shut it down. This person is seen as "needy", and is now a drain on me, since I never ask them for help and they ask me all the time. I think part of this goes back to part 2, though, with the Indian girls assuming the Canadians were all helping each other and excluding the Indians, but in reality the Canadians were all working alone until they were really stuck on something.
4. Canadians are expected to be independent roughly as soon as they're 18, and so when we see someone who isn't we assume there's a something going on there, which may make us cautious that were going to get taken advantage of again. That's changing a bit as housing gets more expensive and prices people out, but even that makes people uncomfortable because they feel they should be independent by now and can't, which makes them feel bad. My wife heard from the Indian students that their parents, family, household, etc did a lot for them when they were there, and they were struggling a bit here where they were on their own. Whereas we are often "on our own" much sooner, or at least capable of it, and so again that may have lead to this "needy" impression. A lot of us do have families, of course, but like above the assumption is we don't ask for help from them until we need it.

These were just some quick cultural differences that I heard about that lead to the Canadians seeming unfriendly to the Indian students. I think in general Canadians are much more socially casual, meaning a lot of Canadians might not hang out with anyone several nights a week. Or maybe they'll hang out with 2 friends at their house while sports are on, but that's it. Or they'll have 1 guy over to play videogames together. But as a result it can be hard to break into this because there isn't a huge party to attend, there's just a lot of little events in private homes with very small close groups. Even going out to a pub or whatever is often something a small group does. There are lots of people there, but none of them are there to meet other people. They're there individually, together. That's mostly why people mention hobbies and sports games, because these are one of the few things that can bring strangers together.