Being Welsh and being from the LGBT+ community is not the same, I hoped I had made that clear in my last sentence by saying a person who is potentially hurt by this word can't chose not to be LGBT+ whereas one can chose not to be Welsh, and accept my middle section within that paragraph has stepped in another direction.
The point I was trying to make at the start (admittedly, misusing "discrimination") is there is some crossover which gives some limited understanding of the experience. For example, queer people being underrepresented in the and/or unfairly represented by the media we see in day-to-day life or being treated as, at best, an afterthought in offices of political power which is also part of being a marinalised group. It's not the same as still having a higher risk of being ostracised by your family, being passed over for a promotion, not being able to dress how you would like to in too many places or having to check travel advice before travelling, but there was a reason the LGBT+ activist groups and Welsh miners were able to work together as demonstrated in film Pride.