Hookup app etiquette question

I'll preface this by saying I think the guy I'm going to talk is just kind of an asshole and I will be blocking him without guilt. What he said was passive aggressive and entitled, but I want to know about the logic behind it.

I've been poking my head into hookup apps like Grindr and Scruff on and off. I'm nervous, because I lived as a woman until my mid 30s and I was taught in no simple terms not to just invite guys over or go to their houses without fully vetting them first or something truly terrible might happen. I'm also kinda busy, so I've been really inconsistent and occasionally taking weeks between going on, and when I go on I often get so many messages I can't respond to them all. (And I'm not hot or anything, this isn't a brag, I assume it's just guys throwing out a wide net in hopes of getting laid.)

One guy that I basically said "Hello" and "I'm doing good" to two weeks ago just messaged me that I shouldn't be on the apps at all if I can't respond when I'm messaged because I didn't respond when he messaged me one word greetings.

I am torn, because I absolutely get it being rude to not say something when someone messages you after you've responded to them before! But I also don't feel like it really works to have that expectation? It's a hookup app, even if I say I'd like to date it's not a dating app. Am I violating the unspoken etiquette for the apps by talking a bit and then vanishing?