Shining: “Uh, what is this exactly?”  
Twilight: “You have your love life, I have mine.”  
Flash: “_{^{I’m just following orders…}}”

Shining doesn’t hate Flash. He just likes to tease him a bit.  
If Flash got into a real trouble, I’m sure Shining Armor would help him immediately.

Perhaps Flash is taking too much orders for his own judgement

VMs with hardware-assisted acceleration in a nutshell

Shining Armor: Twily…  
Twilight: Wha the… WHAT IS IT!  
Shining Armor: Did I interup-  
Twilight: Knock next time, damn it!  
Shining Armor: Okay, sorr. Just wanted to tell you, Cadance and Princess Celestia want to talk about the portal.  
Twilight: Okay…did you see anything?  
Shining Armor: (Sighing) No Twily. I did not see you play with your dolls again.  
Twilight: Good. (trots away)  
Shining Armor: (sighs)  
Flash: Ehm…  
Shining Armor: Don’t. Just… just don’t try to explain anything.  
Flash Sentry: Okay.  
Shining Armor: … nice stitching work.  
Flash Sentry: Thanks. Rarity made them for us.  
Shining Armor: Of course she did.

@ZhaoZoharEX  
That is true, which is why I said it was off-putting, not irritating. There are so many possible awkward situations for him to stumble across.  
@Background Pony Number 17  
That would make things more interesting for him…

@ZhaoZoharEX  
that’s exactly what i was thinking  
@Background Pony Number 17  
now THAT i would like to see

@Trilby Pony  
And it doesn’t help any that his wife the Princess of Love is trying to ship the two.

In Judacris’ pics Shiny doesn’t hate Flash, he just keeps an eye on him. He’s an older brother, after all.

@Trilby Pony  
In this picture at least, he seems to be less “Why you little…” and more “I’m just… gonna come back later…”

This is adorable
 
@fastbreak333  
To be fair, Flash is a subordinate who is dating his sister. It would be somewhat off-putting to be in Shining’s position, so he’s bound to have expressions like that from time to time. Also, it’s funny, which is always a good thing.

@Background Pony #4792  
hi, my name is “exception”

@Background Pony #4792  
I like flashlight. Triggered?

Dawwww XD

@Background Pony #4792  
No, he doesn’t.

@fastbreak333  
He represents us all.

Is it just me or does dm29 delight in making Shining Armor frown at Flashlight?