My boss touched my shoulder in the meeting, and now everyone's talking about it

Last week we were at the weekly meeting at work, and while I was explaining the topic, my boss suddenly touched my shoulder. At first, I didn’t think much of it, but as soon as the meeting ended, everyone was looking at me strangely. I felt like something had been thrown at me. This situation turned into gossip, and the work environment feels very uncomfortable to me. Would it be the right way to complain to HR, or is it better to not make a big deal out of it?