I see nothing wrong with this - it won't cost Argos anything.
It must be 25 years at least since tents stopped being sold as '2 man' and became '2 person'.
We used to call bar staff, barmaids; police officers, policemen but those days are long gone. I don't recall anyone complaining about those changes. I much prefer 'head teacher' to 'headmistress'. There is a huge difference between 'master' and 'mistress' and it's far more than gender.
You seem to be offended about people being offended, Bobbi