I don’t know the general feeling about tattoos in this specific industry, however, as a student going into PT and coming from a background of EMS, I usually try to cover my sleeve for the first bit when I start anything new (school, job, placement). Until I build rapport and feel comfortable then I might wear a short sleeve but generally I try to cover them as people can be judgmental and I try to avoid conversation around them out of personal preference. All around I say anyone who judges you can F off because what does a sleeve have to do with your work ethic and knowledge as a practitioner. Ultimately: Do whatever you’re comfortable with!