A few things boogie:
1) Feminism is an important and complex topic. It isn't something you want to dive into and start labelling people as logical feminists (as opposed to illogical feminists presumably) unless you've done your research. Especially when the feminists you're labelling as logical are as controversial as Sommers.
2) When someone criticises you for your opinions about feminism, a topic which you now admit ignorance of, it's not a good idea to dismiss that as a witch hunt. Feminism is incredibly important to people. It's a liberation movement. So, if you endorse controversial people you can expect some pushback.
3) I have no interest in discrediting you. I just disagree with you about some things.
So, I'm a little hesitant to jump in here, but this actually touches on some stuff that I think is a little wrongheaded. Possibly. If this advice is merely political, then I largely agree with you (because yeah, these topics are a political minefield).
Now, that said, I disagree that people shouldn't be encouraged to jump in and explore these topics, and freely move from theory to theory as they learn more. It should be ok to look into the "wrong" side for a while without people bringing out the knives straight away. Note that that's distinct from people simply calmly disagreeing and pointing out reasons why, which I think is actually what most people here did.
In particular, saying "I think that Sommers is wrong, and here's why" is totally cool and fine. Where it gets dangerous is when you say, "Sommers is wrong, and you shouldn't have even been in this conversation if you didn't already know that." I think THAT attitude is hitting on the tone problems that the social justice movement has that, imho, are at least partly responsible for triggering this mess.
People need to be allowed to make up their own minds, and that includes allowing them to embrace philosophies you consider wrong (even if they ARE wrong), so that when they come around to your point of view, they are there for justifiable reasons, not just because it's what the cool kids believe.
(Now, it's very possible, even likely, that your advice was purely political, just explaining why you kinda need to watch your ass around these issues so you don't get in trouble with a crowd of angry humans. In that case, I agree with you, though it's still a shame that's the reality.)