While browsing around the Fairly Oddparents tag, it has come to my attention that once more, a lot of people have no idea what "proship" means.
So like many before, I shall break it down for you:
Pro- A preffix that means "in favour of; supporting" (Oxford Learner's Dictionary)
Ship (Shipping) - Short for "Relationship. (Fanlore)
Therefore, to be Pro-Ship/Shipping, one is in favor of or supports shipping. In other words, one does not care what other people ship.
Many old school ways to refer to this can be summed up as:
"Ship and let Ship." and "Your ship is not my ship, and that's okay!"
"Pro" does not stand for "Problematic."
In fact, many people who support the rights of people to ship and write whatever fiction they want do not themselves enjoy darker materials and consume solely good-feeling fluff.
Being "Proship" does not say what a person likes in a ship or their fiction anymore than being "Anti" says what they enjoy.
For example, an Anti viciously against age gap ships may also watch South Park, a show famous for it's mature-rated material concerning minors.
That being said, some advice for fandom:
Make things for the things you like and don't waste away focusing on things you dislike.
Want more content for your favorite pairing or platonic relationship? Write or draw it.
Can't write or draw? Give it your best go and learn, or write blog posts gushing about all the things you love until someone else is inspired to make the thing themselves.
You will be happier focusing on the things you enjoy than constantly policing everything you say or type on the internet.
Have a good day!