The argument between Hiccup and Astrid in ”Heather Report Part 1” might be painful to watch and not our favorite Hiccstrid moment, but I feel it’s really important.  For that reason, I am glad the writers included it in Riders of Berk.  The tensions are even more potent since it’s Hiccup who completely messes up - he’s not the perfect Dragon Master all the time, after all.  Crushing after Heather to the point of completely dismissing Astrid and even backlashing against her is a huge mistake on Hiccup’s end.  Granted, Astrid wasn’t responding nicely either, but she definitely had a point and reason to be angry at him.

Through episodes like these, we get to see a more rounded relationship between Hiccup and Astrid.  We watch the awkward scenes when they first fall in love, subsequent scenes when they’re in a relationship, the cheerful scenes when they tease one another, the exciting scenes when they’re in danger and fight for one another, the scenes where they confide in one another, and… the scenes where they don’t see eye-to-eye.  All in all, because of episodes like “Heather Report,” we get a very good look inside the life between Hiccup and Astrid.

But man just look at their facial expressions here.  Ouch. 

This kills me namely for the "Crushing After Heather to the point of completely dismissing Astrid" bit.

No. I 100% disagree. Hiccup wasn’t crushing after Heather (AT ALL), and Astrid had forced sympathy on her side.  Hiccup gets way too much flack in the Heather Report… from the viewers.  Astrid didn’t deserve Hiccup’s support then.  In fact, she was kind of being a dick from the character’s perspective.

Now is it important to show discord between them and how they handle certain situations differently? Yes. That is what made the Heather Report one of my top episodes.  Outside of it being one of the more IC/character-compliant episodes, it showed us how Astrid reacted a stranger on Berk (not well/only marginally reasonable) and how Hiccup reacted to a stranger on Berk (welcoming/arguably naively).

There was no “hiccstrid” here. These episodes were great because it showed Hiccup and Astrid’s differences as individuals and as decision makers. 

May I present a third opinion: whether you think Hiccup deserves the flak or not, this episode (or episode arc, I guess) is just plain terrible.

It’s the only episode I can’t rationalize in any way. Hiccup is so far OOC here it’s like he’s a different person. No, not because of any “crushing” on Heather, but because he’s acting stupid. Hiccup is many things, and he has as many faults as anyone else, but stupidity — this kind of frustrating, it’s-right-in-front-of-your-face stupidity — is NOT one of them. Hiccup is smart and observant, two characteristics that are completely lacking in at least the first episode of this set.

I enjoy the series more than some people, but I can’t even watch “Heather Report.” It’s like it was written by people who deliberately set out to make the most face-meltingly frustrating plot they could come up with, and to make it work they had to completely warp Hiccup’s character to create a bunch of stupid drama between him and Astrid.

Do I think we ought to see discord between Hiccup and Astrid? Absolutely. But not at the cost of good writing and characterization. This was like a badly written fanfic.