Proper Venmo courtesy and college girls

So this week/weekend my best friends younger sister (who I’ve known her entire life) and her friends has been staying with my Girlfriend and I while they enjoy New Orleans for spring break. Now of course I don’t mind this because I want them to enjoy themselves and show them good places to eat and drink and just have fun. They’re 21 but about 6-7 years younger than we are so while they’re right in the Middle of being college students we are firmly in the middle of our 20s when obviously your world view is a little different.

To help them out whenever we’d go places especially that are crowded and they didn’t know what to try or what was the speciality of each particular bar I would just order for them and they’d pay me back. No big deal right. So after the first few days I sent them both their bill via Venmo. Well apparently that was a huge insult and break down of social decorum on my part. Had no idea. They said that it was considered rude and insinuated I didn’t trust them to pay me. I told them I didn’t expect them to pay me on their own because I too was once 21 years old and know how college students operate, which is irresponsibly. I’m At the point where I couldn’t give 2 fricks if I didn’t necessarily approach the proper way to send someone a bill via an online app. The most confusing part is was I supposed to get all their phone numbers and text them the amount owed so that they could then go into Venmo and send it to me at their leisure? Otherwise they’d never know how much they owed me total for the food/drinks. I can see for sure how people hate younger people the older they get

TLDR: my college aged girl guests got offended i sent Venmo requests for their bill of things I bought for them instead of them just sending the money to me on their own (when they’d have no way of knowing how much they really owed me or they were ordering)

I told them ultimately to kick rocks and I don’t care if that’s a breath of courtesy because it’s ridiculous. I also said if they have a problem with it (jokingly of course) they could find another place to stay for free in uptown New Orleans.

ETA: they paid me back so I’m not salty over losing money or anything. Just confused that what I did was somehow considered rude

and let the downvoted rain because I’m not sending you people pictures when you have the entire internet already at your disposal.