I think this is a really interesting conversation and there's a lot of change and acceptance going on in the world right now. Sadly, there's also a concerning amount of division going on too, which is often fuelled by a lack of empathy and fear of the other. Football has the opportunity to lead the way on issues like this and I'm sure lots of work is being done. Unfortunately though I think sport lags behind in many areas.
Humans are tribal. We will always form groups around interests, cultures, preferences and things even more fundamental like gender, enthnicity, age, sexual orientation etc. I'm not sure if it's inclusive or exclusive, it's just how we form relationships attached to our identity, we have an inherent need to 'belong'. The complexity that many people find more difficult to understand is that you can be a member of more than one group, often simultaneously i.e. you are more than just one part of you. You can be LGBT+, Derby and whatever else all at the same time and at other times choose to identify more specifically with one of those groups.
Suggesting that LGBT+ specific groups are exclusive is the same as saying being a Derby County fan is exclusive. Of course it is to a certain extent because that's often how people come together, that's the nature of identity. Some elements of identity are more powerful and emotive than others.
Im' outing myself as a white, middle-class male. It's often hard for us to see the need for this kind of work, particularly if we are not racist, homophobic etc ourselves directly. The systems are still inherently designed to favour us and we don't always recognise the fundamental need for others to have better access into these spaces. LGBT+ and other groups traditionally marginalised still have a lot of work to do to ensure they are heard and represented in mainstream or traditionally white male dominated domains, where they have been excluded and often abused. As some others have said, there's still a lot of work to do on this. What will really help is if those of us from traditional power bases stand alongiside them and proactively support.