Traditionally, parts of Lancashire have very clearly articulated "r"s, similar to the stereotype of Cornwall and the West Country. The pronunciation of these "r"s towards the ends of words is called rhoticity.
In fact, historically, hundreds of years ago, people throughout England used to pronounce strong "r"s. But now, says the research paper, these strong "r"s are definitely dying out.
In Blackburn, young speakers do mostly say their "r"s, but they are, according to the research team, phonetically very weak and often difficult to perceive. And they pronounce them less frequently than older speakers.
I can only apologise that myself and the entire Northern half of the country offend you so much, though I’d call that a glottal stop, rather than a “lazy dropped T”.
I guess it cropping up unexpectedly in some accents/dialects might seem lazy, but in the North, where we talk proper (as opposed to talking “properly” down South), that’s how those words are meant to sound :)