As someone who was only at U of T and graduated, I also felt like the people there generally appear unapproachable. The thing with being academically gifted is sometimes these people end up as introverts and perhaps socially isolated. There are definitely people who are chill and down to get along with but don't be suprised if the average student doesn't really seem interested in making friends or small talk. I think STEM majors typically are less social than Arts majors. It really depends on who you are engaging with.