Need either opinions or someone to explain this to me.

I went out to eat with several colleagues for the first (and last) time. 2 said they ordered things to share between themselves whereas the rest of us just ordered what we wanted for ourselves.

Later, 1 of the 2 asked me if I wanted to try their garlic naan and potato salad. Both of which I said 'yes' to and had a taste (which was no more than like, a bite each). Save from that, I only ate and then finished what I ordered, being something around 68 HKD. Other people had an obvious amount more of the food they offered to share about.

After we were all done and ready to go, the bill came and 1 colleague (let's call her B) offered to pay for all first and get paid back in cash. Once we had left and settled back at work, I went to pay 70 HKD but nooooo. Apparently I owed them 100 HKD purely because "we ate together"?!

1 person (let's call her S) then had a go at me for not paying 100 HKD since we apparently ALL agreed to splitting the bill evenly. She blamed me for not contributing to her decision of splitting the bill evenly when they sat at the opposite end of the table (mind you there were 7 of us). My bad, wasn't paying attention to her conversations at the opposite end of the table while she also wasn't paying any attention to what was happening at my end of the table.

Apparently also my fault they didn't all eat 100 HKD's worth of food but still paid 100 HKD each. My fault they had leftovers and didn't take them to go, thus not getting her 100 HKD'S worth. She didn't know the colleague across from me (let's call him C) ordered 2 items MORE than me AND also had some of the others' food to try but continued to have a go at me because she thought everyone ordered the same amount of food. Eventually, C gave and paid me the difference, to which S responded with "no, you shouldn't have to pay more because we all had the same amount of food," and B offering to repay him by buying him a drink. C never admitted to having more food so I had to call him out on it, to which S did seem a bit surprised about, but then resumed the verbal enslaught towards me for making C pay more than others just because I only wanted to pay for my food (and not his as well).

I'm apparently "rude" for not chipping into others' meals. Or rude of me for not paying for her company? Is this just a different culture or am I missing something here? AITA for wanting to only pay for my food, apparently making it complicated, and not chipping into others' meals and also for their company? Note: S and B seemed to already have some beef with me ever since I called S out for using ableist language so...AITA for that as well?