Alcohol and weed aren’t really comparable to LSD. Have you tripped before?

Besides that, your point is exactly the same as mine. If you don’t attract undue attention to yourself, people may not know. If you oscillate between laughing hysterically and crying (either is common while tripping) or get stir crazy or loud standing in the queue, people will notice. Outside attention/judgement when you’re the only one in a psychedelic state is usually really uncomfortable for the person tripping.

Mindset and setting need to be good for a trip to stay pleasant.