On: Afraid to Google a thing because I don't want the algorithm to think I like it

[HKH2]

I can't see why stereotyping (especially that which is uncharitable) shouldn't be classed as an ad hominem attack.

[marrs → HKH2]

Is observing that someone conforms to a stereotype the same as stereotyping them though?

[HKH2 → marrs]

That is beside the point. Insofar as you are appealing to people's prejudices, you're most probably not making a charitable argument.