It means exist in the same space, interact with regularly.
Given that it is Thanksgiving in the US, after we just elected a corrupt rapist fascist who promises to destroy the economy, environment, etc., this is almost certainly about it being fine to not go to or not invite your insane QAnon/MAGA family friends to Thanksgiving.
Yeah, absolutely. That's, like, the whole idea behind tolerance, right? The idea that you can find someone abhorrent but still accept that they have a right to continue existing?
Tolerance as a concept is pretty central and integral to any functioning society.
Then, how to avoid it? Most people who I know are fucked up, including me. Growing a thick skin is only thing you can do, or you can close yourself with increasingly smaller and smaller group of people falling into a depression.
By its original definition, anything other than genetic information shared between people is a meme. The post is a meme. This comment is a meme. Whatever music you may be listening to in the background rn is a meme.
Dawkins' definition of cultural meme is not the same as internet meme which is a picture that is funny, ironic or relateable. In fact, I don't think this even fits the definition of cultural meme - it's just a screenshot of random person's opinion. If everything is a meme then nothing is a meme.