I may be an art form, but tattooing is also a type of medical procedure. The process involves needles meaning means that surfaces. Supplies and tools must be completely sterile.
“By touching surfaces or items in the tattoo studio. You may make a sterile environment unclean and then the artist has to clean it again before beginning to tattoo”.
The risk of contamination goes both ways.
I always would recommend never put food or drink items on the floor of a tattoo parlor. Though good tattoo shops disinfect and mop their entire shop every day. There’s is always the possibility that fluids or blood from the previous client could still be lingering on the floor.