I don't have the skills to fully delete it yet, but who cares what they'll think of you? Its your phone, and your wallpaper to use, if they think you're gay for it, so what? Its their own problem if they don't wanna associate with you because of a single wallpaper
Don't live to fullfill anyone's expectations anon, live your own life, be happy with your self, use whatever wallpaper you want, fullfill your expections
You only get to live once, why bother with what they have to say?