The bake the cake issue
This is a customer demanding a specific service that isn’t offered at all to anyone. The bakers don’t offer gay wedding cakes to anyone. A gay person could still get a cake for any other purpose. There’s no reason anyone even needs to know the sexual deviations.
The social media ban issue
Bannings involve complete removal from the service. The gays were still allowed to have all the same services that were offered to anyone else. They weren’t banned from the building. If they wanted any normally offered item, they could have it.
Differences
1. Banning entire person vs rejecting specific nonexistent service.
2. The banned people weren’t demanding that a social media site offer a specific service to them that isn’t offered to anyone.
3. One is demanding a specific service that isn’t provided to anyone, the other is denying a service that is provided to everyone else.
Conclusion
In order for it to be the same, it would have to be something like a Nazi demanding that a social media sites make Swastika emoji’s or something. The customer would have to be demanding that the social media site makes something that isn’t offered to anyone. The issues are separate, whether you agree with either one or not.
