Clark and Lois are not as attentive to Jon's needs as they are to Jordan's, but their reaction (or lack thereof) to Jon breaking his arm was particularly egregious. One line that stood out to me was when Lois said, "It could have been worse," in response to Jon being upset about getting hurt and possibly not being able to play football again. It came across as incredibly dismissive and callous. This is compounded by the fact that neither of them bothered to check on Jon when he stormed off. (In fact, he is not seen again for the remainder of the episode.) In short, Jordan seems to get all the attention and support, while Jon is basically expected to take everything on the chin while also being a "good brother".

Don't get me started on the XK. Jon doing drugs is not wrong, especially in comparison to all the lies Clark and Lois told them. Jonathan has no powers, and Jordan does. Clarke spends more time with Jordan. He doesn’t realise that he’s doing real harm by spending most of his time with Jordan. That’s why he took the drug in the first place, but of course Clark doesn't care about this.

Overall they pretty much just emotionally abused and neglected Jonathan. In season 1 Jonathan told his dad he wanted to leave Smallville and go stay at his friend's place and cut contact with Clark and Lois, and Clark said, "No!" and I was like, "WHY?!" Why can't Jonathan leave? Let him go stay with his friend in Metropolis; let him go live with his Aunt Lucy. Fuck, let him go wherever he wants to go; that's not Smallville. Jonathan literally has no powers; he lost football, his friends are arseholes, including Sarah, and his girlfriend is a poor former drug dealer with a poor criminal father. Like, dude, just let him go; he'll have a much better life with Clark and Lois not in his life at all, actually. For 4 seasons Jonathan wants to be left the fuck alone, and these people just keep fucking with him. Jonathan was minding his own business in the first fucking place, and they moved him to Leatherface town. THEY KEEP FUCKING WITH HIM FOR NO REASON!