1) That a person who is not part of a marginalized group doesn't see how often that marginalized group is insulted/oppressed does not, in any way, lessen the actual problem. Don't ever fall into the trap of thinking that because you don't see something that doesn't affect you, that means it's not a common thing.
2) These may be "real life issues that you don't want to deal with" to you, but it's just life to others. By excluding it, you exclude them. By only grudgingly allowing it, you only grudgingly allow them. And they notice. I guarantee they notice.
If you ever have so much as a married couple, even on a Disney level, you're already dealing with sexuality. Choosing to restrict it to heterosexuality is a deliberate choice, and it sends a message.
If you even have people of different sexes and genders, even on a Disney level, you're already dealing with gender identity. Choosing to restrict it to cis is a deliberate choice, and it sends a message.
If you're comfortable sending that message? Well, that's your right, whatever I or others think about it. But you are sending it. There is no "We just don't include that stuff" unless your entire world is made up of a genderless race that has no romantic relationships and reproduces by budding.