I have managed to avoid following any seriously dodgy accounts, but that may be due to the fact that having been online for close to a quarter of a century, I have developed a fairly good intuition about that kind of thing.
I have lately started actually muting people I take serious objections to, so that I do not even see them in the new feed, or when they comment (so far, I have done this with people that espouse views that I find extremely harmful to humanity, such as the antivaxxers)
I think that's why I'm so disappointed in myself: because I have been online for 20 years and I should know better!! IRC taught me enough of that, haha.
And yeah... I have anti-vaxxer friends and family. I choose to stay silent because I'm not a prent, so I really don't know which way I would side, being responsible for a little soul. So far, I just let them say what they want, make their own decisions and yes, mute them. :O
I have tried arguing with antivaxxers (being a parent, it is something I feel strongly about), but I find that it is a waste of time, generally any arguments get countered by accusing me of being paid by big pharma....
So, now I just mute