To be fair, phase boots cost 1350 and give you 22 damage. A claymore is 1400 and gives you 21 damage with the option to build into shadow blade later. If you really think you needed more speed and damage sooner rather than later but you already had treads, perhaps a blade of alacrity and build towards a yasha-into-manta more focussed build.
Your original decision of phase boots as a second pair was, I don't want to say wrong, but there were better options for items that you wouldn't have had to resell until the really stupid lategame where you might suddenly want all the superbig items. Unfortunately it sounds like instead of people who rationally offer suggestions for 'next time' so that you could see some possibilities, you were playing with the type of people who think players will get better if they shout at them enough. Only a small amount of players will get better if you shout at them. Mostly it just turns people off.
All in all it was just a silly situation that sadly escalated from one questionable decision.
(PS desolator is awesome on sniper in the right situations. Sounds like it turned out fine.)