Too difficult to understand? Possibly, but you'd be the better judge of your capacity. I expect it probably is judging by your response. Anyway nothing to get your knickers in a bunch about but maybe a read of the books might be in order for you if you want to throw stones. Have a Pimms and lemonade while you're at it old boy!
I've never flown with an ELP6 who cannot understand the RT. Perhaps your command style brings out something other than the ideal? If they're gritting their teeth you're doing it wrong.