That's simply not true. Perhaps in your immediate circle, but even there I'd have doubts that it is actually so. I've been in the IT for about 20 years and I honestly don't know of any "software people" that pronounce the word as "day-mon", so I't most certainly not true for wider audiences.
> "Day-mon" has better connotations among people unfamiliar with the concept.
You'd get a blank stare from most that don't know what you're talking about and a remark about pronouncing the word wrong from most that do.
Why would you want to mispronounce a word just because you think the actual meaning is bad in some way, is beyond me. The word is what it is, pronouncing it wrong won't change it.
And if you do a bit of research, you'll see that it doesn't mean what some B-rate horror movie made you think that it does.