Feel free to, some proper arguments would be nice.
But please, remember to leave out "gravity crushes her" (Someone with not even superhuman lifting strength could move and jump around), "he danmaku blasts her before she does anything" (He starts with gravity downwards, which she is too strong to be anything but surprised by. After that, a bunch of bones come out of the ground, but are relatively easy to dodge as she is not plastered to the ground. After that a bunch of bones come from her left, but there is no reason why she can't jump over them by stepping on glyphs [remember, sans lacks the strength to slam her hard enough to break them] or just going to the side since they aren't in a side-scroller and that can't be any wider than it is tall. Ghaster Blasters have seconds of charge, and would need to travel several meters before they reach her [Them being instantaneous is game mechanics, unless you wish to make a crt to put sans' blasters at infinite in speed].), nor can you use "she can't get close to him" (Frisk, a much less maneuverable child could, and it is in no way game mechanics]. And let's not ignore that Weiss could shoot a few times at him and he'd be forced to halt attacks to dodge 'em, and that he has no experience dodging anything more complicated than a one-directional charge from someone slower). Oh, you also can't really use the "she can't one-shot" (Between him not wanting to fight, and Weiss wanting to hurt him, and her being high 8-C [8-B to be] is just ridiculous.). He also can't and doesn't teleport spam, and as Dargoo pointed out teleportation in no way means being untaggable, especially when it uses stamina, and "others wanted it closed too" is obviously neither an argument, nor does it count when they either failed to explain why, or just changed their mind.
Boy did that become a wonderfull wall of text.