It means that a Bad workman always blames his tools, just like in real life situation where a loser always makes some silly excuse rather than plainly accepting his defeat.
the origin of this is to be found in the 13th Century, possibly French. 'A bad workman will never find a good tool' In 1640 the quotation was 'never had ill workmen good tools'
It is an expression used to describe someone who fails to accept responsibility. They blame something or someone else instead of admitting that they are at fault
Quarreling with your tools is not only useless, it is just silly. A bad worker would try to blame the tools instead of admitting that he is the one who is doing bad work. Instead of trying to improve...