(Although there are probably still some other instances that I have missed that may not necessarily be caused by the Catholics eg. Witch hunts. History is not my forte

Considering such, I argued that you don't want to generalise others if you don't want to be generalised yourself with something bad.
One of the responses I got for this was "That's mostly the Catholics who did that. And we aren't Catholics. We don't associate with Catholics" Or something like that.
One of the arguments against Christianity I have most often heard was "But the Christians have done bad things that makes the whole of Christianity bad." But with the response I got above, I could say "That's all the Catholics fault. Not all of Christianity is bad, just the Catholics" But it still lacks resposibility, And it would be better to just accept that there have been some Christians who have done wrong rather than "wash my hands" of those who did.
Besides, no matter what your denomination, there are still some people who still aren't tolerant and abuses others and the like.
Anyway, I have also gone into another argument, this time with some non-theist, after splitting hairs about the same subject. I mentioned communism, and as far as I can remember, the response I got was something like "Communism isn't the same."
Very well then. But then, isn't it wrong if I do the same and say "Catholics aren't the same?"
My apologies to any Catholics who may be offended by this thread.