I think both right wing and left wing are generally used in a negative light to mean "person whose values I disagree with".
If you're in the US then right wing might mean Trump supporting, gun-toting, anti-abortion, conservative Christian, whereas in the UK it might be more along the lines of pro Brexit, anti immigration, bring back the death penalty, political correctness gone maaaaaad.
If you're in the US then left wing might mean believes in universal healthcare, supports increased restrictions on gun ownership, pro choice, trans women are women and all good people have pronouns in their email signatures, whereas in the UK it probably means pro NHS, anti bedroom tax and so on, but then after that it gets a bit murky. For example, it's more likely to mean pro remain, unless you're the Jeremy Corbyn type of left wing in which case it probably means pro Brexit. It's more likely to mean trans women are women, unless you're an old school second wave feminist in which case it might mean the opposite. It probably means pro Palestine, but then what about the Jews in the Labour Party?
I think at the most basic level, right wing means broadly believing in a small state with lower taxation people taking responsibility for their own lives as much as possible, and left wing means broadly believing in a larger public sector with higher taxes and greater public spending to help those most in need. But because various identity politics have become attached to these two different camps, the terms are now used in a different way, and generally as a slur about people you don't agree with.