Some more elaborate thoughts copy/pasted from the comments (and much of this is in fact commentary on the comments)...
I continue to be both puzzled and frustrated by the number of people claiming that Lalli is being an ungrateful brat because he reacted badly to Emil's little pep talk. Was Emil trying to be hurtful or selfish? No, definitely not. Was his heart in the right place? Of course it was - he's Emil. But telling Lalli, who's clearly been depressed and is currently facing the death of one of his only remaining family members, that everything's going to be better for both of them because friendship and a flower, was still really insensitive. The fact that Emil had his heart in the right place, or that he didn't mean to be insensitive, doesn't change the fact that he was, in fact, insensitive. And even before today's page, when Lalli did in fact go too far, the reactions of "Lalli better not hurt Emil's feelings!" - never mind that Emil had already hurt Lalli's feelings, albeit inadvertently - were nothing short of disturbing.
It's also disturbing to see Lalli's genuine reasons to be upset be reduced to a toddler throwing a tantrum. One of his last two remaining family members just got handed a guaranteed death sentence. The other one is in a coma. He's being constantly taunted by a murderous horse ghost that's already nearly killed him twice. We've already seen two people (Tuuri and Mikkel) invalidate his feelings in favor of pushing him into behaving the way that they wanted him to behave. So when one of the last remaining people he thinks he can trust says, not even "It's going to be okay," but "Everything's going to be better for me therefore it must be better for you too, and hey, you have my friendship, therefore things are going to be great!", it's hardly a mystery why he finally snapped.
And I don't know whether people are so enamored of Emil that they don't want to admit he's capable of ever doing anything wrong even by accident (never mind that one of his earliest established character flaws is a penchant for putting his foot in his mouth and chewing hard), or can't bear to see him censured for anything because even just trying ought to be good enough no matter how hurtful it is and Lalli ought to just shut up and take it on top of everything else that's been going wrong in his life, but the character bashing in general and the Lalli bashing in particular is really getting old. Does Emil deserve to have something thrown in his face again or for Lalli to cut him off over this? No, of course not - but he does need to be made to understand that his well-meaning but incredibly misguided attempt at comfort is not only not making things better, it's actively making things worse. And if Emil, who up to this point had been doing so well at the whole empathy thing, completely failed to read Lalli's body language and tone of voice in favor of picking out the one word that he wanted to hear, then well... maybe Lalli needs to do something more forceful to get that understanding across. It'll be painful, and I have no doubt that nobody will be fully in the right, but at this point it feels like something that needs to happen.