The USA puts a pretty unique emphasis on not smelling, so this might be a cultural difference if their upbringing wasn't in the US.

When it comes to sweat different people have different issues. I remember that the once I gave a PowerPoint Karaoke in front of maybe 80 people at my university. Afterwards I smelt really badly because of stress induced smell. On the other hand I can dance Salsa and my clothes are wet from sweat because I move that intensely. In my experience that doesn't lead to clothes that stink the next day. Some nerdy people with high level of social anxiety sweat more smelly than average. The only way to know surely whether something smells in a socially unacceptable way is to ask other people. I for example trust my mother to give me honest answers to that question. But you can use any friends for that purpose that you trust to give honest answer and that have decent social skills. It might also be worth to get opinions from multiple people, as people's smell receptors differ. Androstenone for example smells musky and pleasant to some people and bad to others.