Be careful here. We've had guests who call us out for one reason or another then file a "invasion of privacy" complaint demanding a full refund because we showed up to service their request.
On the other hand, there are hosts who don't understand the concept of "hospitality" and may assume every guest is defrauding them in some way. They haven't learned to leave the guests alone.
We can't know what happened here.
In any case, if the host decided to go inside to check if the guest has more in people than was booked for, then it's just stupidity, not worthy of a refund. They didn't harm you or keep you from staying.
Just write it in the review and move on.