Learning how to communicate effectively is not anti-intellectual.
I could write a genius paper with bad grammar and poor spelling, and it wouldn't detract at all from my intellectual arguments. However, very few people look at basic editing, spellchecking, and word choices and say that they're anti-intellectual -- nobody claims that by caring about spelling I'm training my audience to be dismissive or shallow when evaluating papers.
Back when I was writing college essays, I would go even farther; I would tailor my grammar to specific people. I knew that certain forums disliked second-person voice or sentence fragments. Other forums leaned in the opposite direction, and I would take a more casual approach.
If you know that your audience has a certain expectation, bias, or ingrained belief, it is good to address that from the start. It's not encouraging laziness or reinforcing a bad habit, it's just making sure that the people you communicate with are on the same page as you. Worry less about what your responsibilities are as a communicator, and worry more about just getting your ideas across -- regardless of whether that entails couching your language or adding disclaimers.
There are very few disclaimers, language choices, or style alterations that I won't use if I'm trying to communicate an intellectual point with someone I know, because I care about them understanding me. Literally everything else is secondary.