The problem with concluding that a given quintile are 'moochers' is that people are not quintiles.
Here is Sam, in the second quintile, working his ass off and paying taxes. Sam has a job, and no kids. He gets few or no 'transfers'. The figure for his quintile doesn't reflect Sam's situation at all, so it is pretty rude to insult him on the basis of that figure.
Over here is Joe. Joe is also in the second quintile; but he has a disabled daughter, who needs 24x7 care. If he lived in a small village, the community might rally round to help him out; but in the anonymous world of the big city, they outsource the rallying round to government. Is Joe a 'moocher'?
Here's Bob. Bob worked his ass off all his life, paying taxes all of that time, but since the GFC, he hasn't been able to find work. He collects welfare payments to survive while he looks for work, but he's in his fifties, so it may be he will never work again. Is he a moocher?
Declaring 60% of the population to be 'mooching' on the basis of an over-aggregated statistic is a pointless and empty insult, and serves to stifle debate.
The use of the outdated insult 'moocher' also strongly hints that the person throwing the insult has never read anything not written by Ayn Rand, and as a result has the intellectual development of a goldfish. The word serves only one useful purpose - it allows mindless ideologues to self-identity.
Anyone who wants to be taken seriously should find a less dated insult. 'Scrounger' or 'Parasite' or 'Sponger' would all carry similar (lack of) weight without making you look like a Randroid.
ETA - LOLed when I realised that the iPhone autocorrect won't allow 'Moocher' or 'Scrounger', but is OK with 'Randroid'
