It was not a stupid comment. I am Dutch. English is not my native language. I don't expect anyone to learn Dutch. It's a waste of your time. Even if you live in the Netherlands. I don't plan to learn Thai either. Waste of time, I have better things to do. You can expect Thais who write something for tourists to speak English. That is not the case, but it is something you should expect. To me they are just stupid uneducated people. Even if I spoke the Thai language I wouldn't be interested in talking to someone who has so little education that he doesn't speak English.
I am in a similar situation. Be happy that you have a negative pre flight Covid test. Most airlines will not let you board the airplane with a positive test, even not when having a recovery certificate. And about your question: I think it will be hard to get experiences from people.
That stamp proves that you violated the law and broke the rules of your visa. And if you do that with Thailand, why not with other countries? The only positive thing is that other countries no longer see the stamp when you get a new passport. I don't know anyone who has been refused a visa because of that stamp. But for me traveling to Thailand is important. My family lives here. I just wouldn't want any hassle and just follow the rules properly.