I see a lot of posts talking about the drag of a slightly deployed spoiler/spoileron. I don't think that that is the main contributor to a possible tailstrike.
A spoiler (by definition) spoils the airflow over a wing, causing less lift and thus a higher angle of attack for the same lift required. Higher AoA equals higher body angle at rotation.
All that said, I think the total effect of a slightly deployed spoileron due to upwind controls is probably negligible, unless there are further aggravating factors like in the example in the first post.