Yeah, some rogues are not careful when in hide, like they will leave their pet out, have that +0 on their heads, or walk directly into a thunderstorm or something. However, it is possible for people to straight up target a rogue in hide by using a popular rom hack. So if u can tell that he is targeting you in hide (as if he clicked on your character), then he may very well be using a hack. You can AoE a rogue in hide but u cant hit him with a fireball or anything like that
Edit: I forgot to mention that if your level is lower than his, your hide radius is much smaller. For example, a lv70 can spot and target a lv50 rogue in hide from a mile away (your sig indicated lv70 so it probably isnt that for you, but I just wanted others to realize that happens as well)