90% of communication is done through tone, cadence and body language....none of which are visible through this medium.
Combine this with some may have reading comprehension problems, or completly organizing a thought completely before responding is another problem. Though I doubt this is the problem in this case.
Preconceived notion, biases and internal dialog play a part in "forum" discussions as well.
I know this all to well and is the EXACT reason I have longer than average replies to fully explain myself by spelling things out and using metaphors and a little humor to break up the tone.
I just read the thing quickly, but can see that from his point of view that you may be trying to "steal his thunder" or "take the wind out of his sails".......I think his pride was hurt a little and it could be interpreted as you "raining on the parade" and being a "hater". Neverless a great looking Milli and I think he is looking for a little respect in finding something unique.......
I think you were stating "buyer beware" and "that if it looks too good to be true, it probably is."
Color perception is everything it seems and there are just too many variables get into an arguement about it.......I am willing to bet the lights are a major factor in the hue in that pic and you were just trying to point that out.........heck if I posted a pic of a coral and somebody was trying to say.....it will vary from tank to tank ,light to light like everything else does.........I would be thankful rather than frag off a bunch to people and have em mad cuz they didn't get the same piece they thought they were getting.
However, knowing your character Karl......I am sure if its really that bright you will be the first to say so. And you know if it is you will NEVER live it down...........so just in case, post a pic of the echinata and say: "Now thats what a blue coral is supposed to look like".........

Just kidding!!!
Those tips under the 10K Reeflux do a pop more than the 14K Ushio.
Ahhh Drama......glad its not on our forum for once!!!!
Better yet, offer to trade him a frag and find out for yourself?