Country music, probably more than anything else, has people saying "this stuff they call 'country' today isn't really country." The "get off my lawn" mentality is big there. I happen to agree with that sentiment, especially if we are talking Luke Bryan/Florida Georgia Line/Sam Hunt bro country.
But it is interesting to note that any "new" group of country musicians that has ever come along, whether it be all the way back to Nashville Sound (Patsy Cline, Chet Atkins), outlaw country (Johnny Cash, Willie, Waylon, etc.), and neotraditional (Alan Jackson, Clint Black, George Strait) was derided as "not real country" when it debuted. Now, I don't think anyone here would say that the aforementioned artists aren't real country.
I continue to think that the Luke Bryans/FGLs/Sam Hunts of the world have gone beyond the pale, meaning that they are way different from what the prevailing thought of what country music is than Patsy Cline, Johnny Cash, or Alan Jackson ever were. Country music does not mean simply singing with an obvious southern accent, which is what those guys do, IMO. But history might not ultimately see it that way.