The way I see it is simple.
I like to compare it to the Matrix. The LOI is what football really is and watching the EPL/La Liga/Bundesliga etc on TV is the false illusionary world. LOI fans can offer them the choice of which pill they want to take but its up to them. If they choose not to, thats their choice, no need to slag them off for it, you offered them an alternative and they declined it.
We cant go round in life insulting others when we do not share a common thing whether it be LOI or even the kind of food you like.
"He doesn't like Oranges, which I do, but likes Orange Juice, ERRRR". "Oranges are real, the genuine thing but Orange Juice is fake and bad for you."
In this instance, like the one before, we can advise people that Oranges are cheaper and more healthier but if they continue to drink Orange Juice, what can we do to stop them, nothing.
I know there is an element that constantly insult the LOI (without actually going to a game) for their justification in following the EPL, these kinds of people are just deluded. No matter what you say, they will never change their mind even if you had the most convincing proof to the contrary and also, they were up brought with the EPL, so the EPL is only football they know and trust and find it extremely hard to shake it off.
Its very similar also to Atheists trying to convince people of faith that religion is 'this, that and other'. It is up the person of faith to decide.