The Bible claims these are those who by dreaming, defile the flesh, and reject authority, and revile angelic majesties. They revile the things they don't understand. These are grumblers, finding fault, following after their own lusts; they speak arrogantly, flattering people for the sake of gaining an advantage. (Book of Jude)
Apostle Paul sums up the picture in this way, "But realize this, that in the last days difficult times will come. For men will be lovers of self, lovers of money, boastful, arrogant, revilers, disobedient to parents, ungrateful, unholy, unloving, irreconcilable, malicious gossips, without self-control, brutal, haters of good, treacherous, reckless, conceited, lovers of pleasures rather than lovers of God; holding to a form of godliness, although they have denied its power; avoid such men as these." (2 Tim. 3:1-5)