To be fair, in February. Literally 99% of the country was not a hot spot and could have been considered okay to not follow guidelines.
It is also true the guidelines for mask wearing didn't come out until April. Both are the reason using Pelosi's February visit to Chinatown to say she was sending a message to the American public that wearing a mask or following any of the guidelines that hadn't even been established is invalid.
For an issue like this I think it is important to look at the complete body of work for Trump and Pelosi, what each have been saying from the beginning until know. Trump is still saying masks are not as important as his own experts are saying. Pelosi has clearly been saying consistently to follow the guidelines.
If Pelosi made the same trip and did the same things as the February trip tomorrow I would say also chastise her for doing so.