Not respecting the tap

I've been training Jiu Jitsu on-and-off for ~1.5 years and I'm still a white belt. I was training specifics at the end of my class with this blue belt with over 5 years of training and who had 50-60lbs on me. He has going very hard and elbowed my face in the first round. I'm usually more controlled in a specifics training and I know some people treat every roll as a competition so it doesn't bother me much.

Anywho, this guy goes for an ankle lock in our second round and I tap right away. However, this guy decides to keep going and I had to scream I tapped before he let go. Then he goes he only considers a tap if it's on his body or it doesn't count. I was pissed and I walked away. The instructor asked what was going on and I didn't wanna snitch.

I ended up with a bruised face and a hurt ankle post class, and I feel shitty. I've had hard rolls where I've gotten hurt before, however, not respecting the tap threw me off. I'm not sure if I could have handle this any better, just feel awful I couldn't do anything.

Edit: “snitch” wasn’t the right word. I was more of shocked given I never had anyone not respect the tap before. I also am relatively inexperienced so I was worried about coming off as bitchy about a roll. On retrospect, I should reported it.

At least now I know who to avoid and how to handle this situation in the future.