There's no fallacy in this statement at all. It seems you complained about the quality of some software, and it was pointed out to you that someone doesn't believe you will find any software that meets your quality requirements. And that therefore your expectations are indeed too high.
A similar statement would be "we can create bug free software, but you wouldn't be able to pay for it". Which shows very nicely where your statement is wrong: Nobody said perfection is impossible. Someone said perfection is so rarely achieved that you won't be able to show an example. I added that perfection isn't achieved because you cannot afford to pay for it.
@RockpaperZ: You are welcome to show me that a fallacy exists. Even the initial "Perfection is impossible, therefore imperfection should be overlooked", is a perfectly logical statement. It's not useful, but there is no fallacy. More useful would be "High quality is hard to achieve, and not cheap, so don't demand more quality than you can reasonably expect for what you pay". You are also welcome to show the "easy retort".
And I assume that comparing people to "corrupt politicians" won't get you many bonus points either.