I think the issue is that Republicans have convinced there base that minorities are after all there stuff, and want to suppress there freedom's. Democrats have convinced there base that white people don't want them here. Shades of truth to all of it, but it's become political rather than about fighting for the right for everyone to be treated equally, they're fighting a political battle over who can get votes. It's made it incredibly hard to have conversations about it, without being called a racist, or a snowflake or a lot of things.
I can understand why some white family on an average salary who worked hard went to school, and is struggling to get by would look at what they perceive to be a much more successful individual (an athlete, or Hollywood actor, or whomever), telling them they're garbage, because they would like to just watch a football game or be entertained by a movie without getting into the more serious dark side of the country, that most of them feel like they have no power over the problems. Or that the white family has it so much better than them because they're white.
I also understand that to a lot of individuals they feel like it's their best (and maybe only) platform to bring up those issues, because though progress has been made, there are still problems. I say they should protest in whatever legal and peaceful manner they see fit, if it's kneeling than fine, if it's something else than that is good too. If it offends someone, even a military person than maybe they should take that opportunity to think about where there at in life and why it offends them. If someone telling me that they see an issue with police brutality, or that they don't get treated as well as I do because of their skin color, doesn't at least make me think about what it must be like to walk in there shoes than I have a problem.
It's sad that the message got turned what it has, because it was never anti-american, or anti-a piece of waving cloth with stars on it. It was about wanting to talk about how do they make their communities safer, and people safer.