I mean, the real answer to your problem is not to engage; not to feed the trolls. They get more reactions because they don’t care about what’s being said, just that they can bait you into replying. In this case, the best comeback is silence.

I came across a very narrow, 5 story store in Japan, a bit off the beaten path in Akihabara, selling exclusively N scale model trains. They had a floor or two dedicated just to the models, another one for scenery, and at least one just for repair parts for your trains. It was really cool to get to see a store that was pretty clearly a passion project for the owner(s) apparently doing well, and filling quite the niche in the hobby (I imagine)

I spent about 6 months living in Japan in the last year, and had zero trouble getting Yen. There are plenty of ATMs around, especially inside the konbinis, and the fee was rarely more than $1 or $2. At the time, ¥10,000 cost me roughly $66. My debit card barely (if at all) stacked any foreign transaction fees, and I was able to pay for a fair amount of things with my credit card, again with zero foreign transaction fees.