I think its a bit more nuanced.
I dont flaunt any wealth whatsoever when I travel. I am sure a lot of the brehs here dont either cause whos tryna get robbed, but still women in a lot of other countries are kinda just easier to deal with. That being said, i think there could be two things at play. When you are a black, tall, handsome and fit dude you kinda gonna stand out in any country that you arent from - especially if it isnt one of the G7 countries. Thus, the perception might be a) that you are a tourist who they assume to have enough money to be able to travel to whereever youre at and b) because youre not from around there, you are somebody who they can have a good time with and face no repercussions. For instance, a nice restaurant in Cape Town might be nothing for us to go to financially, but for a local girl, the types of men into her who arent tourists prolly aint gonna spend that kinda money or take her there, they not making USD/CAD and are prolly earning far less on top of that.
Like you said its the same everywhere. If i go on youtube, its NY dudes complaining about NY women and vice versa. Those same dudes will come to Toronto and say Toronto girls are easy as hell. Conversely, Toronto women and men will complain about each other and then go to New York in the summer and laud how friendly and straightforward the people there are.
At the end of the day, people are just attracted to people not from their ends. And when people travel they are more free spirited, waste less time and put their best foot forward because theyre trying to maximize the experience. The Toronto woman whos giving the Toronto dude the run around will be much more open to linking the NY dude cause she know he only there for the wknd. The New Yorker will be down to take her to the nice restaurant and spend some bread cause fukk it, thats what ppl do on vacation and he tryna see whats up with her. So people will come back home or talk about tourists saying damn shyt is amazing out there or people from that city are dope, but if they had the same approach when meeting people (as the approacher or the approached) they would probably have similarly great experiences domestically.