Germany, can you PLEASE make up your mind – du or Sie? I offend people on a daily basis because I never get it right. One walking group uses one, another the other. From one photography course to the next – likewise. Even between Volkshochschule courses there is no consensus. I don’t know if the fitness centres still do not have a “policy” but pre-pandemic, they did not, and it was up to each teacher, and even then, half the attendees would use the opposite of what the teacher was using. That would be OK, if it were not for some people getting offended no matter what you do. Half the time I have to talk like in the 1960s Denmark (or current royalty) and half the time spring forward to the present. It is confusing. Get it sorted and update the grammar books accordingly.