You have just received a job offer. You are delighted. Your interest in your current job immediately wanes and you are tempted to tell your boss and colleagues what you really think of them once you quit your job. What have you got to lose? Sure, the look of shock on their faces will be worth it, or not!
However tempted you are to leave the office in a “blaze of glory”, I would strongly recommend that you exercise restraint as you actually have a lot to lose.
Ireland, in the global sense, is a small country with a relatively small business community. When you condense this even further to your specific industry the number of leaders is even smaller. Chances are the main players in your industry will have a courteous respect for each other and will probably have exchanged niceties at industry seminars and conferences. Bad news travels fast so you should ask yourself what your new boss would think of your behaviour towards someone who is at the same level as them, regardless if they are direct competitors or not.
Secondly your new job may not be as you envisaged and you may decide to move on swiftly afterwards. Now you have to ring up your old boss and tell him/her that you require a reference. How do you think he/she will react after the not-so-complimentary names you called them? This would not be a nice situation for anyone, you especially.
The best advice is to show respect, say nothing bad and follow due protocol when you quit your job. That momentary satisfaction of telling your boss what you think of them is quickly outweighed by the damage you could self-inflict in regards future career opportunities.