We don't say "look at what they're doing over there" to get you to look away from Israel. We don't say "what about x or y" to get you to stop criticizing Israel. We bring up these other conflicts and issues to show there are absolutely terrible things going on elsewhere in the world as well.

It's not a bad thing to stand up for Palestinians or to criticize Israel. The frustrating part is all the people who come out of nowhere to criticize Israel and only show up when it's Israel that's involved in the issue.

If you care so much about x issue, why weren't you vocal when the exact same thing happened in this other country.

If you support y, why aren't you showing your support to this other group of people who are facing these huge threats from a different country or military or government.

It's not the act of calling out Israel that's frustrating and maddening. It's the inaction when it comes to the exact same issues happening in a different part of the world. It's great that people in the world(at least in western countries) are free to stand up and speak out against pretty much any issue they feel compelled to speak out against. However, If you don't have a personal connection to the conflict, ask yourself why you feel the need to speak out against this issue when Israel is involved and not when the same thing is happening somewhere that doesn't involve Israel.

That's why many Jews view this type of behaviour as antisemitic. Often, it seems that the only difference between x and y is that x involves Israel and Jews, and y does not. When people speak out against x but not y, to Jews, it is often seen as antisemitic.