0 a situation in which two or more people have very different characters and are unable to have a good relationship with each other:
There's a real personality clash between two of the directors.
Their personality clash made his political life very uneasy.
We must get away from treating every issue as a gaffe, a split or a personality clash.
In the work environment it can too often be seen just as a personality clash.
That was essentially and importantly a personality clash.
It may simply be a personality clash in conditions of stress.
It was not a personality clash, some wayward gesture or a spur-of-the-moment decision.
That employer might be a badly advised small business, or there could have been a personality clash in a small company.
I can see that there might be a clash or a differing of opinions and possibly a personality clash.