I wouldn't say all airlines are the same.
However, in terms of the points raised against Ryanair in the Channel 4 programme, many UK airlines definitely are remarkably similar. The programme reminded me, in amazing detail, of a typical set of scenarios in an airline I used to work for (but, thankfully, ascaped from).
It's therefore unfair to broadcast a programme which declares Ryanair to be the only airline operating in the fashion depicted.
Maybe they should do a series.....
"Dispatches....bmi."
"Dispatches....EasyJet."
"Dispatches....Jet2."
You'd find it would become equally scathing and very repetitive!