Not sure where you've heard that. The overwhelming majority of the reviews aren't saying that (although I'm sure you can find some that do if you want to). Having seen the film, the messages land squarely, thoughtfully and with impact.
It's not a perfect film by any means. It's certainly not the film most people would think it was going to be (prior to release) but it is a thoughtful film. It's got some great "fluff", some excellent gags but it's also got heart and central message that's important. That some have chosen to be offended by it is no surprise but then middle-aged men were never the best at taking feedback.