Your choice of words there is harsh and uncharitable. I don't know why you did that by calling those who do it "foolish". I wouldn't call anyone who's making a legitimate hustle and earning from it foolish, even if I don't like what they're doing. I've profited from some of these tap2earn you classed as foolish and will still earn from more to come. Your advice should've been that those who indulge them should do their own research (DYOR) and be careful, not that they're foolish.
Maybe he is just bitter when he found out that there are really people earning nice amount of money from nothing by participating on these Tap2earn projects. Indeed fool is not a good word choice to use when they are already successful earning but fool is when you got scammed. It still can't be avoided especially on these types of projects that are mostly free. That's great if you're among those who already earn from these types of projects but I wouldn't be overconfident and say that you 'will still still earn more' because we can't predict the future mate. It would be better if we will be humble because those are usually the type of people that are blessed.