It is very likely that they can do this. While airlines, as common carriers, have certain obligations to not discriminate against passegers and to take any paying passenger, they also have a broad discretion to refuse service to people whom are considered disruptive or a threat to their operations or safety--especially in the post-911, hyper-security-conscious world. If they deem you disruptive or a trouble maker or a risk, they probably can refuse you service.Before you submit anything to a newspaper or otherwise publish it in any forum (including social media), be careful: if you make any  factual assertions which are negative and which are not provably true, you could potentially be sued for defamation.