Rickullvi - do you spend time around children? I'm pretty damn strict with my kids but guess what, they're kids. They get whiny sometimes and yes, sometimes have temper tantrums. That's just the reality. My kids are 95% of the time super well-behaved but sometimes, they're not for any number of reasons. Now if that happens and I'm somewhere, I remove them from the situation b/c I don't think that behavior is acceptable in public. That being said - it happens to every single parent/child.
I respect teachers. I expect my children to treat teachers (and everyone else) with respect. But 2 meltdowns in a year (not in a day or even week or month), in a 5 YO to boot, hardly indicates a behavioral problem.