I see ad hominem very often as well as strawmanning. Specifically on lemmy people will say tankie/auth or irl they'll say woke/liberal and then use those insults to further strawman argumenents. Specifically multiple times I have said "hey I voted Kamala but her policies deeply concern me", and people responded with "Uhh how dare you not vote Kamala and openly declare you hate democracy, freedom, and trans people".
I often get the feeling those people see everyone who voices dissent as one big amorphous blob. It's as if every conversation on a topic is part of one long argument, and you get assigned every claim that anyone ever made. Almost like they watched that "moops" alt-right playbook video and drew the exact wrong conclusion.
Yup, every time I talk about workers libertarian they say "uhh but what about china, haha no food". Ignoring the fact that most of their claims are garbage simply being a leftist has caused people to drag me with every leftist ideology and person to ever exist.