Waitress touched my boyfriends arm flirtily, how to react?

When I’m out and about with my boyfriend, I notice that women can get abit flirty with him. The other day I walked into a restaurant and the waitress laughed flirtily about something with him and touched his arm. How do I react to this? I guess just ignore it?

Waitress touched my boyfriends arm flirtily, how to react?
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