To highlight this we gotta disect your answer a little.
Why does your hair stand up when charged? Because the relationship between each other is similarly charged, and the air less similarly - so its going to have the force of gravity, and those 2 charges affecting it.
If you increase both charges from our ‘neutral’ by one yes your hair repels itself greater, but so does the air around it.
Similarly if you were on a super charged planet/atmosphere, your hair wouldn’t stand up at all cause the atmosphere is charged and you are grounded to it - but the second you change your relative environment to earth you’d probably pass out from the discharge