A creepy thing on which I remained silent

So yesterday there was a small function at my home in which some music players were called and my mom told me to give them tea I went to them and served them tea but one of them asked me for water and I took water for him and gave him but at the time of taking water from me he knowingly touched my hand in a very creepy very ugly and in a disgusting manner and said thankyou i was shocked and was confused how to react because this is the first time something like this happened to me so I just nodded and left but now I'm regretting about it that why didn't I yelled at him or took any action for myself even tho I told about it to some people's but that doesn't change the fact that I'm feeling a weird thing inside me!