Is spacetime wholly a mathematical construct and not a real thing?

Speaking of what I understood, spacetime is three dimensions of space and one of the time. If we now look at the general relativity, spacetime is generally counted as a 'tissue'. So my question is whether spacetime is real or just a mathematical construct to understand different things. And if that is a mathematical thing, what does that mean with its distortion / bowing?

>>5
Wikipedia on non-political stuff is reliable overall(unless the topic is really obscure).
Here is an (autistic) algorithm to determine bias level:
1.Is the article about politics? If yes, +2 points
2.Is the article about something controversial? +1 points.
3.Does the article have a long talk page and/or lots of reverts? +1/+1 points
4.Does the article provoke discussion in other pages?+1 points.
5.Does the article have a pre-formed opinion piece as a leading section? +1 points.
6.Is the article topic really obscure or esoteric? +1 points.
7.Has the article been locked from editing? +2 points.
8.Has the article been under administrative oversight? +3 points.
9.Is the article currently on any noticeboards or headline in any project? +2 points.